Heat-insulating casing



Feb. 4, 1930.

P cAsslDY HEAT INSULATING CASING 3 Sheets-Sheet Filed Sept INVENTOR S nN R O T T.. .A Y. BM

Feb. 4, 1930. P. cAsslDY HEAT INSULATING cAsING s sheets-sheet 2 Filedsept. 9. 192e 0' 000 z 0: 0. 0.0.0 0,0,0,0,0 0000 0,0,0,0, 0.0.0.9'A b0000000000000. 003090000000000. 000000000000 0000000000000."0000000000000, 000000000000000000. 000002.0000000000000000.. Y000000000v000000000000* 0 000000000000000000. A 00000000000 00000. 0000000.000000000000000 000000 Vv000 0000000,0

00000000 00 00000000 w0n000000 000 v0000.0000000. 000000 BY rm'ATTORNEYS Patented Feb. 4, 1930 UNITED STATES PATENT OFFICE.

IPERRY CASSIDY, yO1? DARIEN, CONNECTICUT, ASSIGNOR T0 THE BABCOOK &WILCOX i COMPANY, F BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEYHEAT-INSULATING CASINGrv Applicationk led September 9, 1926. Serial No.134,355.

j My present invention relates to casings, such as are commonly used forenclosing furnaces, boilers and the like to prevent the passage of heatfrom such structures, and will be be'stunderstoodvfrom the followingdescription and the annexed drawings, in which Fig. 1 is a section of aportion of a boiler furnacewall and a boiler with a casing embodying oneform of my invention; Fig. 2 is an enlarged view of a portion of` Fig.1k onl the line 22 of Fig. 3; Fig. 3 is a view of Fig.v 2 looking in thedirection of the arrows 3-3 of Fig. 2, and Fig. 4 is a view similar toFig. 2 but showing a modification.

Like reference characters indicate like parts in the various views.

In heat-insulating casings, there is commonly provided a layer of anyheat-insulating material which is ordinarily covered on the exterior andsometimes on the interior by a sheet metal covering. These coverings arey made up of metallic plates and the casing is .further provided withstiifening members extending along the sheet metal covering to hold theparts in position, the ends of these s Stiening members being4ordinarily connected to the framing" ofthefurnace or other structure towhich the casing is applied. As heretofore constructed, the casingcovering `and the stiffening members have been ,ar-

ranged so that there are large metallic paths insulating material, thusnullifying to a large degree the eectiveness of the heatk insulation. Bymy present invention, I provide a means for holding the parts ofthecasing in position and, at the same time, minimize or entirely .v avoidany such jmetallic vpaths throughl the heat-insulating layer.Furthermore, thel panel plates which cover the heatinsulating materialare yflat rand without flanges and may be sheared into plates of thedesired size from sheet metal stock.

In theillustrative embodiment of my in vention shown in Figs. 1, 2'and3, the refractory wall 10 is provided exteriorly with a layer ofheat-insulating material 11 and a sheetV metal exteriory covering madeup of plates 12. Extending along the exterior of kthe casing arestiftening members 13, the ends of which may be connected to the framingof the boiler setting. In the illustrative arrangement, the stiifeningmember is T-shaped in section, with an enlarged head 14 connected to thebody portion of the stifening member. The adjacent edges of a pair ofplates 12 are separated by the body portion of the stiifening member 13with the head 14 inside of the plates 12, this body portion extendingonly a small distance inside the plates 12 and being buried in theheat-insulating layer 11, as shown best in Fig. 2. A packing 15,preferably in the form of a pliable strip of material not affected byheat extends along the joint between the edges of the plates y12 and thestiffening member 13, as shown in Fig. 2, and a metallic bar 16 is laidagainst this packing strip. y

Spaced 'along the body portion of the stiifening member 13 are pressuredevices by which the bars 16 are pressed toward the plates 12 and towardthe stiening member 13 in such a way that the plates 12 are clampedagainst the head 14 and sothat the packing 15 is also pressed into thejoint between the stiffening member and the edges of the plates. In theform illustrated, each pressure device has a double-ended bolt 17passing loosely through an opening 18 in the body portion of thestilfening member, each end of this bolt passing loosely through a bar19 with the outer end of the bar resting against the body portion of thestifening member 13 and its inner end resting against one of the bars16, the ends of the bolt 17 being bent so that these ends are atlright-angles to the surface of the bar 19. On tightening up the nuts 2Oon the bolt 17, it will be obvious that each bar 19 is forced bothvertically and horizontally in Fig. 2, and since the reaction of thebolt is against the body portion of the stiffening member 13, the'netresult is that the plates 12, the head 14 and the packing strips 15 areall clamped together and held in position so that the plates 12 arefastened to the stiffening member 13 and, at the same Stime, the jointbetween the edges of such what is known as a double casing used in someplaces where the heat-insulating material is not held against arefractory wall,

as is the case in Fig. 2. In such casing, both the exterior and theinterior of the refractorylayer 21 is provided with a metallic coveringmade up of plates 22 on the exterior of the layer and plates 23 on theinterior of the layer. The stiffening member 13 and the arrangement bywhich the edges of the platesl 22 are held against the sti ening memberand the joint sealed are the same as those illustrated in Fig. 2 andneed not be described again.'

Preferably the edges of the plates 23 on the interior of the casing arespaced apart a distance somewhat greater than the width of the head 14of the stiffening member and the -layer of heat-insulating materialopposite this space may be continued as by a block 24 of some suitableheat-insulating material or may be filled with a mass of plasticinsulation.' The space between the edges of the plates 23, 23maybe'covered by an auxiliary covering plate 25 which may be fastened toone of the plates 23. Where the casing is accessible from its interiorside, it is obvious that the entire casing may be assembled before theblock 24 is placed in position and covered bythe auxiliary plate 25.

Preferably the plates 22 and 23, with the insulation 21 between them,are formed into panels, held together by bolts 26V in the usual manner,with a washer or packing 28 between the metallic washer 27 and theadjacent plate.

The panels are readily moved into place fromy the exterior because ofthe cutting-awayof the plates 23 to form an opening wider than the head14 of the fixed stiffening member 13.

rate hat metallic plates, members extending along said plates,` each ofsaid members having a portion extending between the adjacent edges of apair of plates and an enlarged head on one side of said plates, apacking at the joint between said edges and said niember, means Vto holdthe edges of said plates against said head and the packing against saidplates and the body kportions of said members, said means comprising ametallic bar extendingalong said packing yparallel to the joint, andmeans, connected to said inember, to press said metallic bar towardsaidy plates and toward said body portion.

l 2. A casing comprising a plurality of separate flat metallic plates,members extending alongsaid plates, each of said members havf ing aportion extending between vthe adjacent edges of a pair of plates and anenlarged head on one side of said plates, a packing at the joint betweensaid edges'and said member, meanslto hold the edges of said platesagainst said head and the packing against said plates and the bodyportions of said members,A saidmeans comprising a first metallic barextending along rsaid packing parallel to the joint, a second bar havingone end resting against said body portion and the other end resting onsaid iirst bar, and a pressure device connected to said member to forcesaid second bar and said first bar toward said plates and toward saidbody portion.

3. A furnace casing comprising a plurality of separate fiat metallicplates, members extending along said plates, each of said members havinga portion extending betweenl the adjacent edges of a pair of plates andan enlarged head on one side of said plates, barsextending along theopposite sidesof said plates, packing material interposed between saidbars and said members and between said bars and said plates, andclamping means for forcing said bars towards said plates and saidmembers and ksaid heads against said plates whereby substantiallyairtight joints are formed.

4. A furnacecasing comprising a plurality of separate flat metallicplates, members extending along said plates, each .of saidmembersliaving a portion extending between "rec the adjacent edges of apair of plates and an v enlarged head onone side of said plates, apacking at thejoint between said edges and said member,y and means to.hold the edges of said plates against said head and the packing in thejoint between said member and said plates whereby said casing isrendered air tight. j' 1 n 5. A furnace casing comprising a plurality ofseparate metallic plates, members extending `along said plates, each ofsaid members having a portion extendingbetween the adj acent'edges of apair of plates andan enlarged head on one side of said plates, barsextending substantially parallel to said plates and "ics v iio onopposite sides of tlie'joint between the edges thereof, packing meansinterposed between said bars and said plates, and clamping means actingbetween saidmembers andthe respective bars andconstructed andarrangediac to create pressure between eachfof said bars and the associatedmember Vand plate.

6. A furnace casingcomprisinga plurality',

of separate metallic plates, members extending along said plates, eachof said members havinga portion extending between the adjacent edges ofa pair of platesand an en- I larged head on one side of said plates,bars Y extending substantially parallel to said I Y f plates and onopposite sides of the joint between the edges thereof, a packing striploc-ated at the joint between a plate and thel associated member, andmeans comprising said bars for exerting pressure against said y strip inthe direction of the head and of the extending portion of the member,whereby the joint between said plate and said associated member issealed.

7 A furnace casing comprising a plurality of separate metallic plates,members extending along said plates, each of said members having aportion extending between the adjacent edges of a pair of plates and anenlarged head on one side of said plates, bars extendingV substantiallyparallel to said plates and on opposite sides of the joint between theedges thereof, a heat insulating pad of yielding material interposedbetween each of said bars and the associated plate and member,

' and clamping means constructedand arv ranged to force each of saidbars against said pad in the directions of the associated plate andmember'and said head against the oppo- `site sides of said plates.

PERRY CASSIDY.

